U.S. Nutrient Recovery Technology Helps Facilities Meet Phosphorus Regulation Limits

Seven MagPrex nutrient recovery systems are currently operational or under construction in the United States. MagPrex provides treatment plants with a high orthophosphate removal efficiency, which helps plants meet phosphorus regulation limits.

Struvite precipitation is detrimental to treatment plants. MagPrex prevents crystallization in downstream biosolids by forming struvite as it strips out CO2, elevates the pH, and adds MgCl2 to augment Mg2+ in a controlled environment. MagPrex fits between the anaerobic digester and the dewatering equipment. Struvite crystals — the converted orthophosphate within the digestate — can be harvested and used as fertilizer.

MagPrex removes struvite and significantly improves treatment efficiency, and according to the manufacturer, it reduces polymer consumption up to 30%; reduces disposal costs up to 20%; reduces phosphate recycle loads up to 90%; reduces maintenance costs up to 50%; and no sodium hydroxide is required for pH change

“It’s because of our USA installations. We raised the bar to deliver plant-specific results in municipal and industrial applications,” says Gerhard Forstner, Centrisys/CNP president. “Our U.S. team works hard on the continuing development of MagPrex and the reuse of the struvite fertilizer. We understand the diverse requirements of North American customers. As a U.S.-based company, we’ve addressed critical factors in wastewater and industrial applications by leveraging our extensive experience, unique process capabilities and cost efficiencies.”

Meridian Wastewater Plant | Meridian, Idaho

MagPrex will aid the 10 mgd plant to meet low-effluent phosphorus levels with startup in 2022. MagPrex was chosen based on process effectiveness, lower lifecycle costs, and meeting chemical reduction goals for the treatment process. By concentrating the phosphorus in the solids stream, the plant will permanently remove a significant portion of phosphorus from the overall treatment process and prevent recycling within the plant.

Central Valley Water Reclamation Facility | Salt Lake City, Utah

The 60 mgd facility goals include greater than 85% orthophosphate removal and struvite harvesting capabilities. The 2022 installation includes five Centrisys THK350 sludge thickeners for primary and WAS sludge.

Metro Water Recovery | Denver, Colorado

The 220 mgd facility is the world’s largest struvite recovery system from digestate. MagPrex reduces phosphorus recycle loads, struvite formation, and poor dewaterability. MWR paired MagPrex with eight Centrisys CS26-4 dewatering centrifuges and has an annual $600,000 dewatering and disposal costs savings.

Drake Water Reclamation Facility | Fort Collins, Colorado

This 18 mgd facility achieves very low effluent phosphorus limits, below 0.5 mg/L. The MagPrex reactor reliably removes more than 90% of orthophosphate from the phosphorus recycle loop going back to the front of the plant. This allows the facility to consistently meet the lower phosphorus discharge limits set by the Colorado Department of Public Health & Environment. Installation included two Centrisys CS26-4 dewatering centrifuges.

Fox River Reclamation District | Elgin, Illinois

The 25 mgd plant installed MagPrex to process anaerobically digested sludge and sequester soluble phosphorus as struvite. MagPrex is being optimized, but has already recorded effluent soluble phosphorus concentrations of less than 25 mg/L. By reducing the soluble phosphorus, MagPrex decreases the struvite buildup maintenance costs and the flow efficiency loss for downstream treatment processes such as dewatering.


Centrisys is a United States manufacturer of dewatering centrifuges and sludge thickeners. It provides global centrifuge service, repair and parts for all decanter centrifuge brands. CNP, a division of Centrisys, supplies nutrient recovery and advanced biosolids treatment systems for phosphorus recovery and thermal hydrolysis processes.

262-654-6006   info@centrisys-cnp.com   www.centrisys-cnp.com



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